+ DSFML <-> OpenGL example

git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1516 4e206d99-4929-0410-ac5d-dfc041789085

DSFML/samples/dsfml/opengl/opengl.d

@@ -0,0 +1,155 @@
+module opengl;
+
+import dsfml.system.all;
+import dsfml.audio.all;
+import dsfml.window.all;
+import dsfml.graphics.all;
+
+import std.perf;
+
+import derelict.opengl.gl;
+import derelict.opengl.glu;
+
+void main()
+{
+	// Create the main window
+	auto window = new RenderWindow(VideoMode(800, 600), "DSFML OpenGL", Style.Default, ContextSettings(24,8,0,3,1));
+
+	DerelictGL.load();
+	DerelictGLU.load();
+	
+	// Create a sprite for the background
+	auto backgroundImage = new Image("Data/opengl/background.jpg");
+	auto background = new Sprite(backgroundImage);
+
+	// Load an OpenGL texture.
+	// We could directly use an Image as an OpenGL texture (with its Bind() member function),
+	// but here we want more control on it (generate mipmaps, ...) so we create a new one from the image pixels
+	GLuint texture = 0;
+	{
+		auto image = new Image("Data/opengl/texture.jpg");
+
+		glGenTextures(1, &texture);
+		glBindTexture(GL_TEXTURE_2D, texture);
+		gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, image.width, image.height, GL_RGBA, GL_UNSIGNED_BYTE, image.getPixelsArray().ptr);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+	}
+
+	// Enable Z-buffer read and write
+	glEnable(GL_DEPTH_TEST);
+	glDepthMask(GL_TRUE);
+	glClearDepth(1.f);
+
+	// Setup a perspective projection
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	gluPerspective(90.f, 1.f, 1.f, 500.f);
+
+	// Bind our texture
+	glEnable(GL_TEXTURE_2D);
+	glBindTexture(GL_TEXTURE_2D, texture);
+	glColor4f(1.f, 1.f, 1.f, 1.f);
+
+	// Create a clock for measuring the time elapsed
+	auto clock = new PerformanceCounter();
+	clock.start();
+	
+	// Start game loop
+	while (window.isOpened())
+	{
+		// Process events
+		Event event;
+		while (window.getEvent(event))
+		{
+			// Close window : exit
+			if (event.Type == EventType.Closed)
+				window.close();
+
+			// Escape key : exit
+			if ((event.Type == EventType.KeyPressed) && (event.Key.Code == KeyCode.Escape))
+				window.close();
+
+			// Adjust the viewport when the window is resized
+			if (event.Type == EventType.Resized)
+				glViewport(0, 0, event.Size.Width, event.Size.Height);
+		}
+
+		// Draw the background
+		window.saveGLStates();
+		window.draw(background);
+		window.restoreGLStates();
+
+		// Activate the window before using OpenGL commands.
+		// This is useless here because we have only one window which is
+		// always the active one, but don't forget it if you use multiple windows
+		window.active = true;
+
+		// Clear the depth buffer
+		glClear(GL_DEPTH_BUFFER_BIT);
+
+		// We get the position of the mouse cursor, so that we can move the box accordingly
+		float x =  window.input.mouseX * 200.f / window.width  - 100.f;
+		float y = -window.input.mouseY * 200.f / window.height + 100.f;
+
+		// Apply some transformations
+		glMatrixMode(GL_MODELVIEW);
+		glLoadIdentity();
+		glTranslatef(x, y, -100.f);
+		
+		clock.stop();
+		glRotatef(clock.microseconds() * 0.000001 * 50, 1.f, 0.f, 0.f);
+		glRotatef(clock.microseconds() * 0.000001 * 30, 0.f, 1.f, 0.f);
+		glRotatef(clock.microseconds() * 0.000001 * 90, 0.f, 0.f, 1.f);
+
+		// Draw a cube
+		float size = 20.f;
+		glBegin(GL_QUADS);
+
+			glTexCoord2f(0, 0); glVertex3f(-size, -size, -size);
+			glTexCoord2f(0, 1); glVertex3f(-size,  size, -size);
+			glTexCoord2f(1, 1); glVertex3f( size,  size, -size);
+			glTexCoord2f(1, 0); glVertex3f( size, -size, -size);
+
+			glTexCoord2f(0, 0); glVertex3f(-size, -size, size);
+			glTexCoord2f(0, 1); glVertex3f(-size,  size, size);
+			glTexCoord2f(1, 1); glVertex3f( size,  size, size);
+			glTexCoord2f(1, 0); glVertex3f( size, -size, size);
+
+			glTexCoord2f(0, 0); glVertex3f(-size, -size, -size);
+			glTexCoord2f(0, 1); glVertex3f(-size,  size, -size);
+			glTexCoord2f(1, 1); glVertex3f(-size,  size,  size);
+			glTexCoord2f(1, 0); glVertex3f(-size, -size,  size);
+
+			glTexCoord2f(0, 0); glVertex3f(size, -size, -size);
+			glTexCoord2f(0, 1); glVertex3f(size,  size, -size);
+			glTexCoord2f(1, 1); glVertex3f(size,  size,  size);
+			glTexCoord2f(1, 0); glVertex3f(size, -size,  size);
+
+			glTexCoord2f(0, 1); glVertex3f(-size, -size,  size);
+			glTexCoord2f(0, 0); glVertex3f(-size, -size, -size);
+			glTexCoord2f(1, 0); glVertex3f( size, -size, -size);
+			glTexCoord2f(1, 1); glVertex3f( size, -size,  size);
+
+			glTexCoord2f(0, 1); glVertex3f(-size, size,  size);
+			glTexCoord2f(0, 0); glVertex3f(-size, size, -size);
+			glTexCoord2f(1, 0); glVertex3f( size, size, -size);
+			glTexCoord2f(1, 1); glVertex3f( size, size,  size);
+
+		glEnd();
+
+		// Draw some text on top of our OpenGL object
+		window.saveGLStates();
+		Text text = new Text("DSFML / OpenGL demo"c);
+		text.position = Vector2f(250.f, 450.f);
+		text.color = Color(255, 255, 255, 170);
+		window.draw(text);
+		window.restoreGLStates();
+
+		// Finally, display the rendered frame on screen
+		window.display();
+	}
+
+	// Don't forget to destroy our texture
+	glDeleteTextures(1, &texture);
+}